# Question #2997a

##### 1 Answer

#### Explanation:

Assuming that you're dealing with *percent concentration by mass*,

**conversion factor**.

This is essentially what a solution's concentration does -- it helps you go from, in this case, *mass of solution* to *mass of solute* or vice versa.

A *by mass* solution will contain **for every**

#1.0 color(red)(cancel(color(black)("kg"))) * (10^3color(red)(cancel(color(black)("g"))))/(1color(red)(cancel(color(black)("kg")))) * overbrace("0.25 g sucrose"/(100color(red)(cancel(color(black)("g solution")))))^(color(purple)("= 0.25% m/m")) = color(green)(|bar(ul(color(white)(a/a)color(black)("2.5 g sucrose")color(white)(a/a)|)))#